Rob, I don't think this relates to DCAT, only to the PROF vocabulary. DCAT does not have roles, and the question here is about combining the role and the artifact in a single resource.
The artefact does not have to have a stable URI, just a URI, but if the URI is not known then you can't link to the artifact. So I don't understand that objection.
I think the main question is: what is the harm in separating the role and the artifact? Are there advantages to doing so? Disadvantages? What are the implications of each choice?
As with all comments, we need to resolve this. We can't ask the group to make a decision without presenting them with choices that are clear. I was hoping you could write a short "votable" explanation of the issue(s).
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